Abstract
The effect of different structure-directing agents (SDAs) on the nucleation of MTW (the structure code for ZSM-12 recommended by the International Zeolite Association Structure Commission) is shown by means of transmission electron microscopy (TEM). A loose-fit SDA interacting only weakly with the framework seems to have pore-filling character only and results in large domains with rather perfect ZSM-12 framework structure. Conversely, a more tight-fit SDA interacts markedly with the framework during the crystallization and causes simultaneous growth of small domains as well as frequent twinning. By comparison of simulated and experimental electron diffraction patterns as well as high-resolution transmission electron microscopy (HRTEM) images, the proposed crystal structure of ZSM-12 is substantiated. The presence of an organic SDA confined in the one-dimensional channels is established in HRTEM images obtained from calcined as well as as-synthesized specimens. This result is corroborated not only by corr...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
